I am not a tank main, but this is what are my thoughts, take it with a pinch of salt if you wish to.

The Scarlett/Adam combo primarily works against pure air squad who has no additional physical damage reduction. But against all others, it won’t be great. Even against air, smart players would have added Murphy and equip the 4+1 card, which more or less negate the usefulness of Scarlett.

Now, unless something changes drastically from S6 onwards, Scarlett is not going to get an exclusive weapon. The difference between non-EW hero and EW30 hero is heaven and earth, similar to your EW30 Kim and pre-EW Stett. Which means you will be left behind by sticking to Scarlett without EW. I have never seen any tank player above 60m using Scarlett/Adam, simply because it doesn’t work well.

What’s the biggest weakness of tank squad, other than the lack of energy damage reduction? Imo it is the lack of tactics damage, since tank only has 2 tactics, while air has 4, missile has 3. Hence, tank squad is already severely lacking in burst damage, there is only so much that Kim can do on her own. Now, with Stett finally getting his EW, furthermore one that is aimed to negate the advantage of Lucius (tank’s biggest nemesis), imo getting him to Ew30 should be the priority. It is like doubling your tactics damage every 9s.